By creating a filters, install the appropriate conditions, make filter to the addresses not e-mails from which messages are coming (for example, firstname.lastname@example.org lock the domain spammerdomain.com)
In the case if using filters does not help and spam to your mailbox come in a large scale, use increased protection against spam.
!Please note that in increased spam protection mode, there is a possibility that the conventional (important for you) letters, in some cases, may also mistakenly moved to the Spam folder. Don’t publish your e-mail address in public sites, try to unsubscribe from different letter receiving and never reply to spam messages. Other suggestions see here
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